Mark Doelger and Mary Minihan have been the co-owners of B&H, Geologists since 1992, having succeeded founders James A. Barlow, Jr. and John D. Haun upon their retirements.

Mark is a Registered Professional Geologist in the state of Wyoming (PG-737) and President of B&H. Five Wyoming governors have relied on Mark’s energy expertise. Mark received the AAPG Public Service Award in 2011. He can be reached at

Mary has worked in administrative management her entire career, after graduating college with business degree. She is a native of Casper, and involved in various community organizations. She can be reached at